Compositions and methods for removing ammonia from gas

Patent metadata

Field	Value
Publication number	US-2019321803-A1
Application number	US-201916388112-A
Country	US
Kind code	A1
Filing date	Apr 18, 2019
Priority date	Apr 20, 2018
Publication date	Oct 24, 2019
Grant date	—

Abstract

Disclosed herein are methods of controlling the amount of carboxyl groups attached to a hydrochar, the methods including subjecting a composition that includes a stover composition to hydrothermal carbonization to form a hydrochar, wherein the amount of carboxyl groups attached to the hydrochar can be controlled by the amount of lipids in the composition. Methods of removing ammonia from a gas using disclosed hydrochars and the hydrochars themselves are also disclosed.

First claim

1 . A method of removing ammonia from a gas, the method comprising:
subjecting a composition comprising a stover composition to hydrothermal carbonization to form a hydrochar, the composition comprising an amount of lipids to provide a carboxyl group content in the hydrochar of not less than 0.3 millimoles (mmol) carboxyl groups per gram of hydrochar; and contacting the gas with the hydrochar, whereby the ammonia is adsorbed onto the hydrochar.

2 . The method according to claim 1 , wherein the stover composition comprises plant material from: corn, sorghum, soybean, rice, wheat, or any combination thereof.

3 . The method according to claim 1 , wherein the composition comprises corn stover, condensed distillers solubles (CDS), spent brewers grains, or any combination thereof.

4 . The method according to claim 1 , wherein the composition comprises one or more stover compositions and one or more added lipids.

5 . The method according to claim 4 , wherein the one or more added lipids comprise corn oil.

6 . The method according to claim 1 , wherein the carboxyl group content is not less than 0.4 millimoles (mmol) carboxyl groups per gram of composition.

7 . The method according to claim 1 , wherein the carboxyl group content can be determined using a Boehm titration.

8 . The method according to claim 1 further comprising adding lipids to a stover composition to form the composition subjected to hydrothermal carbonization.

9 . The method according to claim 8 further comprising desorbing the ammonia from the hydrochar.

10 . The method according to claim 1 , wherein the hydrothermal carbonization is done at a temperature from 180° C. to 220° C.

11 . An article comprising:
a hydrochar produced from a composition comprising a stover compositions, the hydrochar having a carboxyl group content of not less than 0.3 millimoles (mmol) carboxyl groups per gram of composition.

12 . The article according to claim 11 , wherein the stover composition comprises plant material from: corn, sorghum, soybean, rice, wheat, or any combination thereof.

13 . The article according to claim 11 , wherein the composition comprises corn stover, condensed distillers solubles (CDS), spent brewers grains, or any combination thereof.

14 . The article according to claim 11 , wherein the composition comprises one or more stover compositions and one or more added lipids.

15 . The article according to claim 14 , wherein the one or more added lipids comprise corn oil.

16 . The article according to claim 11 , wherein the carboxyl group content is not less than 0.4 millimoles (mmol) carboxyl groups per gram of composition.

17 . The article according to claim 11 , wherein the carboxyl group content can be determined using a Boehm titration.

18 . A method of controlling the amount of carboxyl groups attached to a hydrochar, the method comprising:
subjecting a composition comprising a stover composition to hydrothermal carbonization to form a hydrochar, wherein the amount of carboxyl groups attached to the hydrochar can be controlled by the amount of lipids in the composition.

19 . The method according to claim 18 further comprising adding lipids to a stover composition to form the composition subjected to hydrothermal carbonization.

20 . The method according to claim 19 further comprising desorbing the ammonia from the hydrochar.

Assignees

• Univ Minnesota

Inventors

• Valentas Kenneth J
• Gerner Gabriel
• Plewka Scott
• Pursell Zachary

Classifications

• B01J20/20

  comprising free carbon; comprising carbon obtained by carbonising processes · CPC title

• B01J2220/485

  Plants or land vegetals, e.g. cereals, wheat, corn, rice, sphagnum, peat moss · CPC title

• B01J20/3085

  Chemical treatments not covered by groups B01J20/3007 - B01J20/3078 · CPC title

• B01J20/3078

  Thermal treatment, e.g. calcining or pyrolizing · CPC title

• B01J20/22 Primary

  comprising organic material · CPC title